The Collaborative International Dictionary of English v.0.48:
Slugger \Slug"ger\, n. One who strikes heavy blows; hence, a boxer; a prize fighter. [Cant or Slang] [1913 Webster] [1913 Webster]WordNet (r) 3.0 (2006):
slugger n 1: (baseball) a ballplayer who is batting [syn: batter, hitter, slugger, batsman] 2: a boxer noted for an ability to deliver hard punches [syn: slugger, slogger]